mruby binding for Cocos2d-x

Working in progress, very limited classes and methods are implemented.

• Create cocos2d-x project.
• Put source files under mruby_binding into libs/ directory in the project.
• Add header include paths for
  • mruby_binding/include
• For Xcode, set Target > Build Settings > Search Paths > Always Search User Paths to NO.
• Use CCMrubyEngine and start mruby script using executeScriptFile()

#include "CCMrubyEngine.h"

  CCMrubyEngine* pEngine = CCMrubyEngine::defaultEngine();
  CCScriptEngineManager::sharedManager()->setScriptEngine(pEngine);
  
  std::string path = CCFileUtils::sharedFileUtils()->fullPathForFilename("hello.rb");
  pEngine->executeScriptFile(path.c_str());

• Please see hello.rb
• Add Classes/* and Resources/* to the according paths
• Run.